Japanese aviation authorities said Wednesday they found no evidence of overcharging in a charred lithium-ion battery on the All Nippon Airways Co. Boeing 787 Dreamliner that made an emergency landing last week in Kagawa Prefecture.
The output voltage of the main battery of the Dreamliner was within a normal range, the Japan Transport Safety Board said, based on its analysis of the flight data recorder. The main lithium-ion battery is under the cockpit.
Prior to the finding, excess voltage was suspected as the cause of smoke that appeared inside the ANA jet during its flight to Tokyo on Jan. 16.